WO2022238359A1

WO2022238359A1 - Voltage conversion system and method for manufacturing such a voltage conversion system

Info

Publication number: WO2022238359A1
Application number: PCT/EP2022/062545
Authority: WO
Inventors: Arnaud COIA; Emmanuel Talon; Pierre Smal
Original assignee: Valeo Systemes De Controle Moteur
Priority date: 2021-05-10
Filing date: 2022-05-10
Publication date: 2022-11-17
Also published as: FR3122801B1; CN117730630A; EP4338559A1; FR3122801A1

Abstract

The invention relates to a voltage conversion system (1000) comprising: • a voltage converter (100); • a housing (200) comprising a cooling device, said voltage converter (100) being positioned inside said housing (200) so as to be in thermal contact with said cooling device; and • an electrical connector (300) comprising a first bus bar (310) and a second bus bar (330), said electrical connector (300) being designed to connect said voltage converter (100) electrically to at least one electrical network via said first bus bar (310) and said second bus bar (330); said system (1000) being characterised in that it also comprises at least one electrical connection part (400) including a first connecting bus bar (450), said first connecting bus bar (450) being electrically and mechanically connected to said first bus bar (310), said first connecting bus bar (450) being in thermal contact with said cooling device via the outside of said housing (200).

Description

Title of the invention: Voltage conversion system and method of manufacturing such a voltage conversion system

TECHNICAL AREA

The subject of the invention is a voltage conversion system intended to equip a motor vehicle. The invention also relates to a method of manufacturing such a voltage conversion system.

TECHNOLOGICAL BACKGROUND

Voltage conversion systems are known comprising a voltage converter, a housing comprising a cooling device, the voltage converter being positioned inside the housing so as to be in thermal contact with the cooling device, and a connector electric.

In such systems, the electrical connector is designed to electrically connect the voltage converter to at least one electrical network via a first and a second bus bar.

However, in such voltage conversion systems, the heat generated at the level of the electrical connector can become excessive when the powers implemented by the voltage converter increase.

To solve this problem, it is known to increase the dimensioning of the electrical connector. Thus, with such a solution it is necessary to use different electrical connectors to produce voltage conversion systems implementing different powers.

Alternatively, it is also possible to use a single voltage conversion system to address different powers by sizing the electrical connector with respect to the greatest power addressable by the voltage conversion system. Thus an oversizing of the electrical connector is necessary to withstand the thermal stresses, which makes this solution relatively expensive when the voltage conversion system is used for powers lower than that used for the dimensioning of this voltage conversion system.

The object of the invention is to at least partially overcome the aforementioned problems.

SUMMARY OF THE INVENTION

To this end, it is proposed, according to a first aspect of the invention, a voltage conversion system comprising:

• a voltage converter, • a housing comprising a cooling device, the voltage converter being positioned inside the housing so as to be in thermal contact with the cooling device, and

• an electrical connector comprising a first and a second busbar, the electrical connector being designed to electrically connect the voltage converter to at least one electrical network via the first and the second busbar,

• the system also comprises at least one electrical connection part comprising a first connecting busbar, the first connecting busbar being electrically and mechanically connected to the first connecting busbar, the first connecting busbar being in thermal contact with the device cooling through the exterior of the case.

Within the meaning of the invention, a bus bar is a low impedance conductor, for example a metal bar, for example made of copper.

Thanks to the thermal contact of the first connecting bus bar with the cooling device via the exterior of the casing, it is possible to cool this first connecting bus bar, which limits its heating as well as heating of the electrical connector to which the first connecting busbar is electrically and mechanically connected.

Thanks to the invention, it is possible to obtain a voltage conversion system that can implement different powers without having to adapt the electrical connector.

Thus, the electrical connector is sized for the smallest of the powers that can be implemented by the voltage converter and to address powers greater than this, the voltage conversion system comprises an electrical connection part which provides cooling. of the electrical connector.

A voltage conversion system according to the invention may further comprise one or more of the following optional characteristics, taken in isolation or else according to any technically possible combination.

According to a first characteristic, the electrical connector is fixed to the housing.

According to another characteristic, the voltage converter is a DC-DC voltage converter also called DC/DC converter.

According to another characteristic, the voltage converter is a DC/AC voltage converter also called a DC/AC converter. According to another feature, the electrical connector further comprises a first and a second connection terminal, the first busbar and said second busbar being capable of being mechanically and electrically connected to said at least one electrical network by means of the first connection terminal and the second connection terminal, the first connection busbar being electrically and mechanically connected to the first busbar via the first connection terminal. According to another feature, the electrical connector further comprises a first and a second connection terminal, the first busbar and said second busbar being capable of being mechanically and electrically connected to said at least one electrical network by means of the first connection terminal and the second connection terminal.

According to another feature, the first connecting busbar is electrically and mechanically connected to the first busbar via the first connection terminal. According to another feature, the first connection terminal is a metal stud, for example steel.

According to another characteristic, the second connection terminal is a metal stud, for example steel.

According to another characteristic, the voltage conversion system further comprises a second electrical connection part comprising a second connecting busbar, the second connecting busbar being electrically and mechanically connected to the second busbar, the second connecting busbar link being in thermal contact with the cooling device through the exterior of the housing.

According to another characteristic, the second connecting busbar is electrically and mechanically connected to the second busbar via the second connection terminal. According to another characteristic, the housing further comprises a support plate capable of delimiting a first volume of the housing in which a cooling fluid is intended to circulate to cool the voltage converter with respect to a second volume of the housing in which is positioned the voltage converter.

According to another characteristic, the housing comprises a cooling fluid inlet, a cooling fluid outlet and the first volume comprises at least one cooling channel connecting the cooling fluid inlet to the cooling fluid outlet.

According to another characteristic, the case comprises a bottom and a peripheral side wall surrounding the bottom and the cooling channel is delimited at least in part by the support plate and/or the bottom and/or the peripheral side wall and/or by at least one wall extending between the bottom and the support plate.

According to another characteristic, the box comprises said at least one wall extending between the bottom and the support plate.

According to another characteristic, the peripheral side wall comprises a first face facing the outside of the case, the peripheral side wall extending between the bottom and the support plate, a part of the support plate extending substantially perpendicular to the first face of the peripheral side wall, said part comprising a through hole arranged to receive the connector electrical, the support plate comprising a second face on which the voltage converter is positioned and a first face opposite the second face of the support plate, the electrical connector being fixed to the second face of the support plate.

According to another characteristic, the peripheral side wall, the support plate and said at least one wall extending between the bottom and the support plate are made in continuity of material, for example by a casting process.

According to another feature, the first connecting bus bar is in thermal contact with the cooling device via the exterior of the casing via a thermally conductive connecting element, for example by a thermally conductive paste or by a thermal pad. (in English “gad pad”).

According to another feature, the second connecting busbar is in thermal contact with the cooling device via the exterior of the casing via a thermally conductive connecting element, for example by a thermally conductive paste or by a thermal pad. .

According to another characteristic, the thermally conductive connecting element can also be electrically insulating.

According to another characteristic, the cooling device comprises a sole having a first face intended to receive heat to be dissipated emitted by the voltage converter, and at least one fin extending on a second face of the sole opposite to the first face, the first face of the sole being turned towards the inside of the casing, the first connecting bus bar being in thermal contact with the second face of the sole.

According to another feature, the electrical connection part further comprises a first connection terminal, the first connecting busbar and the second busbar being capable of being mechanically and electrically connected to said at least one electrical network via respectively the first connection terminal and the second connection terminal.

According to another feature, the electrical connection part further comprises a second connection terminal, the first connecting busbar and the second busbar being capable of being mechanically and electrically connected to said at least one electrical network via respectively the second connection terminal and the second connection terminal.

There is also proposed, according to a second aspect of the invention, a method of manufacturing a voltage conversion system according to the first aspect of the invention and comprising

• obtaining a voltage converter,

• obtaining a case including a cooling device,

• the positioning of the voltage converter inside the case so that the voltage converter is in thermal contact with the cooling device, • obtaining an electrical connector comprising a first and a second busbar and designed to electrically connect the voltage converter to at least one electrical network via the first and the second busbar,

• obtaining an electrical connection part comprising a first connecting bus bar,

• the electrical and mechanical connection of the first connecting busbar to the first busbar, and

• placing the first connecting busbar in thermal contact with the cooling device via the exterior of the casing.

Optionally, the manufacturing method includes attaching the electrical connector to the housing.

The invention will be better understood in the light of the following description, given solely by way of non-limiting example and referring to the following figures:

DESCRIPTION OF FIGURES

The [Fig. 1] is a top view of a voltage conversion system according to a first embodiment of the invention.

The [Fig. 2] is an exploded three-dimensional view of the voltage conversion system shown in Figure 1.

The [Fig. 3] is an exploded three-dimensional view of the top of the voltage conversion system housing shown in Figure 1.

The [Fig. 4] is a view of the lower part of the case of the voltage conversion system shown in Figure 1.

The [Fig. 5] represents the electrical connector without overmoulding of the voltage conversion system of figure 1.

The [Fig. 6] is an exploded three-dimensional view of a voltage conversion system according to a second embodiment of the invention.

The [Fig. 7] represents, in the form of a flowchart, the different stages of a method of manufacturing the voltage conversion system of figure 1.

DETAILED DESCRIPTION

Figure 1 shows a top view of a voltage conversion system 1000 in a first embodiment of the invention.

As shown in Figure 2, the voltage conversion system 1000 includes a voltage converter 100 configured to convert a first electrical voltage VI to a second electrical voltage V2, a housing 200 comprising a cooling device intended to cool the voltage converter 100, an electrical connector 300 and an electrical connection part 400.

In the example described here, the electrical connector 300 is also attached to the housing 200. In other words, the electrical connector 300 is a separate part of the housing 200 before its assembly on the housing 200.

The voltage converter 100 is in the example described here a DC/DC voltage converter called DC/DC voltage converter. This voltage converter is intended to be embedded in a vehicle in order to perform a voltage conversion between a first electrical network and a second electrical network of the vehicle. Typically, the first electrical network is a low voltage network delivering a first electrical voltage V 1 less than 30V, for example approximately 24 or 12V, and the second electrical network is a high voltage network which delivers a second electrical voltage V2 greater than 30V , for example 48V.

In the example described here, the voltage converter 100 comprises an electronic board 110 comprising a plurality of voltage choppers (not shown in FIG. 2) in parallel. Each of the voltage choppers comprises an inductance and two transistors operating as electronic switches. These two transistors are, in the example described here, MOSFET transistors (from the English “Metal Oxide Semiconductor Field Effect Transistor”). As a variant, these transistors can also be IGBT transistors (standing for “Insulated Gate Bipolar Transistor”) or even FET power transistors (standing for “Field Effect Transistor”) made of gallium nitride (GaN).

It is known that such a voltage converter 100 can address different operating powers depending on the number of voltage choppers arranged in parallel.

Referring to Figure 3 and Figure 4, the housing 200 comprises a bottom 210, a peripheral side wall 220 surrounding the bottom 210, a support plate 230 and a cooling device intended to cool the voltage converter 100.

The peripheral side wall 220 extends between the bottom 210 and said support plate 230 and comprises a first face facing the outside of the box 200.

In the example described here, the bottom 210 is in the form of a lid positioned on a support surface of the peripheral side wall 220 and fixed, for example by friction-mixing, to the peripheral side surface 220.

Alternatively, the cover can be screwed onto a bearing surface of the peripheral side wall 220 by inserting a seal between the cover and the peripheral side wall 220.

The support plate 230 delimits a first volume PV 1 of the casing 200 in which a cooling fluid, for example water, is intended to circulate to cool the voltage converter 100 and a second volume PV2 of the casing 200 in which is mounted the voltage converter 100. The support plate 230 thus comprises a first face facing the first volume PV 1 and a second face facing the second volume PV2, the second face being opposite the first face.

Furthermore, the voltage converter 100 is positioned and fixed on the second face, for example by screws. As a variant, the voltage converter 100 is fixed on the second face by riveting or else by gluing.

The housing 200 further comprises a cooling fluid inlet 240 and a cooling fluid outlet 250 while the first volume consists of a cooling channel connecting the cooling fluid inlet 240 to the cooling fluid outlet. 250.

In the embodiment described here, the cooling channel is delimited by the first face of the support plate 230, by the bottom 210, by the peripheral side wall 220 and by walls 260 extending between the bottom 210 and the plate. -bracket 230.

In this way, the circulation of the cooling fluid in the cooling channel and, consequently, under the support plate 230 supporting the voltage converter 100 makes it possible to cool this voltage converter 100.

Thus, the cooling channel, the cooling fluid inlet, the cooling fluid outlet and the support plate constitute a cooling device for the voltage converter 100.

In addition, a part 235 of the support plate 230 extends substantially perpendicular to the first face of the peripheral side wall 220, this part 235 comprising a through hole 236 arranged to receive the electrical connector 300 so that this electrical connector 300 is fixed to the second face of the support plate 230.

In the example described here, the peripheral side wall 220, the support plate 230 and the walls 260 are made in continuity of material, for example of metal such as aluminum, for example by a casting process. In other words, the peripheral side wall 220, the support plate 230 and the walls 260 constitute a single piece of metal, for example aluminum, made for example by a casting process. Alternatively, the peripheral side wall 220, the support plate 230 and the walls 260 can be parts made separately before being assembled.

Referring to Figure 5, the electrical connector 300 includes a first positive bus bar 310, a second positive bus bar 320 and a negative bus bar 330, the negative bus bar 330 being intended to be connected to an electrical ground.

In the example described here, the first positive bus bar 310 is metallic, for example copper. Likewise, the second positive bus bar 320 is metallic, for example copper. Finally, the negative bus bar 330 is also metallic, for example copper.

In the example described here, the first positive busbar 310, the second positive busbar 320 and the negative busbar 330 are also formed in one piece, ie in continuity of material. The electrical connector 300 is designed to electrically connect the voltage converter 100 to the first electrical network via the first positive busbar 310 and the negative busbar 330 and to the second electrical network via the second busbar positive 320 and negative bus bar 330.

It will be appreciated that in the example described, the first positive busbar 310, the second positive busbar 320 and the negative busbar 330 are rigid electrical conductors designed to withstand electrical current densities of at least 10A/mm ² .

Thus the first positive busbar 310 and the negative busbar 330 present between them the first electric voltage V1 and the second positive busbar 320 and the negative busbar 330 present between them the second electric voltage V2 when the voltage converter 100 converts the first electric voltage VI into the second electric voltage V2.

In the example described here, a first positive connection terminal is fixed on a planar portion of a first end of the first positive busbar 310, a second positive connection terminal is fixed on a planar portion of a first end of the second positive bus bar 320 and a negative connection terminal is fixed on a planar portion of a first end of the negative bus bar 330.

The first positive connection terminal, the second positive connection terminal and the negative connection terminal are respectively, in the example described here, studs 312, 322, 332. The studs 312, 322, 332 are threaded and made of metal, for example steel.

The first positive connection terminal and the negative connection terminal make it possible to mechanically attach the busbars 310, 330 to electrical power cables in order to electrically connect these busbars 310, 330 to the first electrical network. Thus, the electrical connector 300 and the power supply cables are sized for a first power, corresponding to a number NI of choppers, supplied to the first electrical network by the voltage converter 100.

Similarly, the second positive connection terminal and the negative connection terminal make it possible to mechanically attach the busbars 320, 330 to electrical power cables in order to electrically connect these busbars 320, 330 to the second electrical network.

The attachment of an electric cable to one of these busbars is carried out for example by inserting the threaded stud of the busbar into the eye of a terminal of the electric cable then by screwing a nut on the threaded stud so pressing the terminal against the bus bar in order to make the electrical connection between the bus bar and the terminal.

The electrical connector 300 further includes a magnetic core 340 surrounding the first positive bus bar 310, the second positive bus bar 320 and the negative bus bar 330.

The first positive bus bar 310, the second positive bus bar 320 and the negative bus bar 330 are at least partly overmoulded with an insulating material 350 (not visible in FIG. 5 but visible in FIG. 2), for example by a insulating plastic material. In the example described here, the magnetic core 340 is mounted around the first positive bus bar 310, the second positive bus bar 320 and the negative bus bar 330 after molding these three bus bars 310, 320, 330.

In the example described here, the electrical connector 300 is fixed, for example by screws, inside the housing 200 on the second face of the support plate 230 at its part 235 by inserting through the second face of the plate - support 230 the electrical connector 300 in the through hole 236.

More specifically, the first end of the first positive busbar 310, the first end of the second positive busbar 320 and the first end of the negative busbar 330 are inserted into the through hole 236 on the side of the second face of the tray- bracket 230 so that these ends are located outside of housing 200. To provide a seal between electrical connector 300 and housing 200, a gasket surrounding through-hole 236 may be inserted between electrical connector 300 and housing 200 when attaching electrical connector 300 to housing 200.

Referring to Figure 2, the electrical connection part 400 includes a connecting bus bar 450, a first connection terminal and a second connection terminal.

The first connection terminal and the second connection terminal are respectively, in the example described here, threaded studs 420, 430 fixed to a flat part of the connecting bus bar 450. The studs 420, 430 are made of metal, for steel example.

In the example described here, the connection busbar 450 has the general shape of a T, the first connection terminal and the second connection terminal being each fixed to a different end of the transverse bar of this T. link 450 also includes at the base of the T a through hole 410 which makes it possible to mechanically connect the link bus bar 450 to the first positive bus bar 310.

As a variant, the connection busbar 450 can have the general shape of a Y, the first connection terminal and the second connection terminal being fixed respectively to one end of each branch of this Y. The connection busbar 450 also comprises at the base of the Y a through hole 410 which makes it possible to mechanically connect the connecting bus bar 450 to the first positive bus bar 310.

In yet another variant, the connecting busbar 450 may have the general shape of an I, the first connection terminal and the second connection terminal being fixed respectively to the vertical bar of this I. The connecting busbar 450 also comprises at the base of the I a through hole 410 which makes it possible to mechanically connect the connecting bus bar 450 to the first positive bus bar 310.

The fixing of the connecting bus bar 450 to the first positive bus bar 310 is carried out by inserting the threaded stud 312 into the through hole 410 then by screwing a nut on the threaded stud 312 so as to press the connecting bus bar 450 against the first positive bus bar 310. The connecting busbar 450 and the negative busbar 330 are thus capable of being mechanically and electrically connected to the first electrical network via the first connection terminal and the negative connection terminal respectively and via the intermediary respectively of the second connection terminal and the negative connection terminal. The use of two connection terminals makes it possible to mechanically and electrically fix the connecting bus bar 450 to the first electrical network by means of two different electrical power cables.

Thus, the electric current flowing in each of these two electric cables is reduced so that with equal sizing the electric cables heat up less.

Furthermore, in the example described, the electrical connection part 400 is fixed, for example by screws, on at least one external face of the housing 200. As a variant, the electrical connection part 400 can be fixed on at least one outer face of the housing 200 by riveting or by gluing. Alternatively or optionally, the electrical connection part 400 can also be fixed, for example by screws, to the electrical connector 300, for example to the overmoulding 350.

Further, when attaching electrical connection piece 400 to housing 200 and/or electrical connector 300, connecting bus bar 450 is brought into thermal contact with housing cooling device 200 through the exterior of this box 200.

In the example described here, the connecting busbar 450 is in thermal contact with the exterior of the housing 200 via a thermally conductive element, for example by a thermal pad, placed between an exterior surface of the housing 200 and a surface of the connecting busbar 450.

In the example described, three thermal pads 510, 520 and 530 (in Figure 1 only thermal pads 510 and 530 are visible) are placed between housing 200 and connecting bus bar 450.

Alternatively, the thermally conductive element can be a thermally conductive paste.

Furthermore, the thermally conductive element can also be electrically insulating.

In the example described here, the connecting busbar 450 is in thermal contact with the bottom 210 and with the peripheral side wall 220 of the housing 200.

In this way, the circulation of the cooling fluid in the cooling channel and, therefore, in contact with the bottom 210 and with the peripheral side wall 220 makes it possible to cool the connecting bus bar 450.

Thanks to this thermal contact with the cooling device of the box 200 from the outside of this box 200, the connecting bus bar 450 can be cooled, which limits its heating as well as the heating of the two connection terminals, of the cables connected to these two connection terminals and the electrical connector 300.

In other words, thanks to the invention, the current density that can transit in the connecting bus bar and in the first positive bus bar 310 can be increased substantially. Thus, it is possible without changing the dimensioning of the electrical connector 300 and of the box 200 to address different levels of power to be supplied to the first electrical network.

For a first power level, the voltage converter 100 comprises a first number NI of choppers and the first electrical network is connected by a single electrical cable to the positive connection terminal of the first positive bus bar. In other words, the 1000 system can provide the first level of power without the need to use the 400 electrical connection part.

For a second power level higher than the first power level, the voltage converter 100 comprises a second number N2 of choppers greater than the first number NI and the first electrical network is connected by two electrical cables to two different connection terminals of the link busbar 450, this link busbar 450 being itself connected to the positive connection terminal of the first positive busbar.

Remarkably, thanks to the invention, it is possible to have an identical dimensioning of the electric cable(s) for the first and the second power level.

Optionally, the cooling device may comprise a radiator comprising a soleplate and at least one fin (not shown in the figures). The sole of the radiator comprises a first face intended to receive the heat to be dissipated emitted by the voltage converter 100, and a second face opposite the first face. On the second face, said at least one fin extends. In other words, the first side of the sole is facing the inside of the case and the second side of the sole is facing the outside of the case. For example, the bottom 210 of the box 220 can constitute such a sole. In the example described here, the connecting bus bar 450 is in thermal contact with the second face of the sole, i.e. with the outer part of the bottom 210, via the thermally conductive element, i.e the thermal pad, and by the side walls 220 of the housing 200.

Figure 6 shows an exploded three-dimensional view of a voltage conversion system 1000' in a second embodiment of the invention.

Elements which are identical or similar to those of the first embodiment bear the same reference numeral in the description of the second embodiment.

In this second embodiment, the voltage conversion system 1000' comprises a second electrical connection part 500 and the casing 200' differs from the casing 200 in that the part 235' of the support plate 230' comprises a point of fixing 238 on which is fixed, for example by screwing the second electrical connection part 500.

The second electrical connection part 500 comprises a second connecting bus bar 550 connected at a first end to the threaded stud 320 of the negative bus bar of the electrical connector 300 and at a second end to the attachment point 236.

In the example described here, the second bus bar 550 also includes two connection terminals at its second end. Both connection terminals are metal studs threaded 520, 530, for example steel fixed on a flat part of the second end of the second connecting bus bar 550.

The second connecting bus bar 550 also comprises at its first end a through hole 510. The attachment of the second bus bar 550 to the stud 320 is carried out by inserting the stud 320 into the through hole 510 then by screwing a nut onto the threaded stud 320 so as to press the second connecting bus bar 550 against the negative bus bar 330.

The first connecting busbar 450 and the second connecting busbar 550 are thus able to be mechanically and electrically connected to the first electrical network via the first connection terminal 420 and the first connection terminal 520 respectively and by via the second connection terminal 430 and the second connection terminal 530 respectively.

The use of the two connection terminals 520, 530 makes it possible to mechanically and electrically fix the second connecting busbar 550 to the first electrical network by means of two different electrical power cables.

Furthermore, the second connecting bus bar 550 is fixed on the support plate 230' by inserting between the second connecting bus bar 550 and the support plate 230' a thermally conductive element, for example a thermal paste. The thermally conductive element can also be electrically insulating.

In the embodiment described here, the second connecting busbar 550 is in thermal contact with the support plate 230' of the box 200'.

In this way, the circulation of the cooling fluid in the cooling channel and, consequently, in contact with the support plate 230' makes it possible to cool the second connecting bus bar 550.

Thanks to this thermal contact with the cooling device of the box 200′ from the outside of this box, the second connecting busbar 550 can be cooled, which limits its heating. Referring to Figure 7, an exemplary method 2000 of manufacturing voltage conversion system 1000 will now be described.

During a step E2100, a voltage converter 100 is obtained.

During a step E2200, a box 200 comprising a cooling device is obtained. During a step E2300, the voltage converter 100 is positioned in the housing 200 so that the voltage converter 100 is in thermal contact with the cooling device,

During a step E2400, an electrical connector 300 comprising a first positive busbar 310 and a negative busbar 330 and designed to electrically connect the voltage converter 100 to at least one electrical network via the first busbar positive 310 and negative bus bar 330 is obtained. During a step E2500, the electrical connector 300 is fixed to the box 200,

During a step E2600, an electrical connection part 400 comprising a connecting bus bar 450 is obtained.

During a step E2700, the link busbar 450 is electrically and mechanically connected to the first positive busbar 310 of the electrical connector 300.

In a step E2800, the connecting busbar 450 is placed in thermal contact with the cooling device through the exterior of the housing 200.

It will also be noted that the invention is not limited to the embodiments described above. It will indeed appear to those skilled in the art that various modifications can be made to the embodiments described above, in the light of the teaching which has just been disclosed to them.

For example, the voltage converter could be a DC/AC voltage converter and the electrical connector could only be able to electrically connect the voltage converter 100 to the second electrical network. In other words, in this exemplary embodiment, the electrical connector would comprise a single positive busbar, the connection terminal of which would be connected to the first connecting busbar of the electrical connection part, this first connecting busbar itself being -even connected to the case of the electrical conversion system for its cooling.

As another example, voltage conversion system 100 could have no cooling channel and only include a heatsink. In this embodiment, the bottom 210 and the support wall 230 constitute one and the same piece.

Furthermore, the terms used in the claims should not be interpreted as being limited to the elements of the embodiments previously described, but should on the contrary be interpreted as including all equivalent elements the provision of which is within the reach of those skilled in the art. applying general knowledge.

Claims

[Claim 1] A voltage conversion system (1000, 1000') comprising: a) a voltage converter (100), b) a housing (200, 200') including a cooling device, said voltage converter (100) being positioned within said housing (200, 200') so as to be in thermal contact with said cooling device, and c) an electrical connector (300) comprising a first (310) and a second bus bar (330) , said electrical connector (300) being adapted to electrically connect said voltage converter (100) to at least one electrical network via said first (310) and said second bus bar (330), said system (1000, 1000') being characterized in that it also comprises at least one electrical connection part (400) comprising a first connecting busbar (450), said first connecting busbar (450) being electrically and mechanically connected to said first (310) ba rre bus, said first connecting bus bar (450) being in thermal contact with said cooling device through the exterior of said housing (200, 200').

[Claim 2] Voltage conversion system (1000, 1000') according to the preceding claim wherein the electrical connector (300) further comprises a first (312) and a second (332) connection terminal, said first bus bar ( 310) and said second bus bar (330) being capable of being mechanically and electrically connected to said at least one electrical network via said first connection terminal (312) and said second connection terminal (332), respectively, said first connecting busbar (450) being electrically and mechanically connected to said first (310) busbar via said first connection terminal (312).

[Claim 3] Voltage conversion system (1000') according to one of the preceding claims further comprising a second electrical connection part (500) comprising a second connecting busbar (550), said second connecting busbar ( 550) being electrically and mechanically connected to said second busbar (330), said second connecting busbar (550) being in thermal contact with said cooling device through the exterior of said housing (200).

[Claim 4] Voltage conversion system (1000, 1000') according to one of the preceding claims, in which the housing (200, 200') further comprises a support plate (230, 230') capable of delimiting a first volume (PV 1) of the casing (200, 200') in which a cooling fluid is intended to circulate in order to cool said voltage converter (100) with respect to a second volume (PV2) of the casing (200, 200') in which said voltage converter (100) is positioned.

[Claim 5] A voltage conversion system (1000, 1000') according to the preceding claim wherein said housing (200, 200') comprises a coolant inlet (240), a coolant outlet (250) and said first volume (PV 1) comprises at least one cooling channel connecting said cooling fluid inlet (240) to said cooling fluid outlet (250).

[Claim 6] Voltage conversion system (1000, 1000') according to the preceding claim, in which the housing comprises a bottom (210) and a peripheral side wall (220) surrounding said bottom (210) and in which the cooling channel is delimited at least in part by said support plate (230, 230') and/or said bottom (210) and/or said peripheral side wall (220) and/or by at least one wall (260) extending between said bottom (210) and said support plate (230,

230').

[Claim 7] A voltage conversion system (1000, 1000') according to the preceding claim wherein said peripheral side wall (220) comprises a first face facing outward from said housing (200), said peripheral side wall (220) extending between said bottom (210) and said support plate (230, 230'), a part (235, 235') of said support plate (230, 230') extending substantially perpendicular to said first face of said peripheral side wall (220), said part (235, 235') comprising a through hole (236) arranged to receive said electrical connector (300), said support plate (230, 230') comprising a second face on which is positioned said voltage converter (100) and a first face opposite said second face of said support plate (230, 230'), said electrical connector (300) being fixed to said second face of said support plate (230, 230').

[Claim 8] A voltage conversion system (1000, 1000') according to one of claims 6 to 7 wherein said peripheral side wall (220), said support plate (230,

230′) and said at least one wall (260) extending between said bottom (210) and said support plate (230, 230′) are made in continuity of material, for example by a foundry process.

[Claim 9] A voltage conversion system (1000, 1000') according to one of the preceding claims wherein said first connecting busbar (450) is in thermal contact with said cooling device via the exterior said housing (200, 200') via a thermally conductive connecting element, for example by a thermally conductive paste or by a thermal pad (510, 530).

[Claim 10] Voltage conversion system (1000, 1000') according to one of the preceding claims, in which the said cooling device comprises a sole having a first face intended to receive heat to be dissipated emitted by the said converter (100), and at least one fin extending on a second face of the sole opposite the first face, said first face of the sole facing the interior of the housing, said first connecting bus bar (450 ) being in thermal contact with said second face of the sole.

[Claim 11] Voltage conversion system (1000, 1000') according to one of the preceding claims, in which the electrical connection part (400) further comprises a first connection terminal (420), said first connection busbar (450) and said second bus bar (330) being adapted to be mechanically and electrically connected to said at least one electrical network via said first connection terminal (420) and said second connection terminal (332), respectively.

[Claim 12] Voltage conversion system (1000, 1000') according to the preceding claim wherein the electrical connection part (400) further comprises a second connection terminal (430), said first connecting bus bar (450) and said second bus bar (330) being capable of being mechanically and electrically connected to said at least one electrical network via said second connection terminal (430) and said second connection terminal (332), respectively.

[Claim 13] A method of manufacturing (2000) a voltage conversion system (1000, 1000') comprising: a) obtaining (E2100) a voltage converter (100), b) obtaining ( E2200) of a case (200, 200') comprising a cooling device, c) positioning (E2300) the voltage converter inside the case (200, 200') so that said voltage converter (100 ) or in thermal contact with said cooling device, d) obtaining (E2400) an electrical connector (300) comprising a first (310) and a second busbar (330) and adapted to electrically connect said voltage converter (100) to at least one electrical network via said first (310) and said second (330) bus bar, e) obtaining (E2600) an electrical connection part (400) comprising a first connecting busbar (450), f) the electrical and mechanical connection (E2700) of said first busbar of bonding (450) to said first busbar (310), and g) thermally contacting (E2800) said first bonding busbar (450) with said cooling device through the exterior of said housing ( 200, 200').